Sort the server directory and add the restore task installer

The README and Code of Conduct files move to server/resources, the
scripts that build and deploy them to server/scripts. The new
install_restore_task.ps1 installs a scheduled task as SYSTEM that puts
the files back every 30 minutes, so the shell server's root user can
neither stop it nor change the copies it restores from.

Co-Authored-By: Claude Code <noreply@anthropic.com>

server/README.md

@@ -0,0 +1,23 @@
+# The shell server
+
+The website's terminal connects to a shell server, whose root user logs in at `wss://web.nowhere.wirs.ing`.
+
+## Layout
+
+- `resources/` — the files in the root user's home directory: `README`, `README.en`, `CODE_OF_CONDUCT` and
+  `CODE_OF_CONDUCT.en`.
+- `scripts/make_files.py` — builds the resources, the website's pages as terminal text.
+- `scripts/install_restore_task.ps1` — installs the scheduled task that puts the resources back every 30 minutes.
+
+## Rebuilding the resources
+
+    python3 server/scripts/make_files.py
+
+## Installing the restore task on the server
+
+Copy `server/scripts` and `server/resources` to the server and run this in an elevated PowerShell:
+
+    powershell -ExecutionPolicy Bypass -File .\scripts\install_restore_task.ps1
+
+The task runs as SYSTEM, so the root user can neither stop it nor change the copies it restores from. It also
+runs at startup. Remove it again with `-Uninstall`.